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lc19.c
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lc19.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
#include <argp.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#ifdef __APPLE__
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#else
#include <sys/sendfile.h>
#endif
#include "args.h"
#include "ssl.h"
#include "endpoint.h"
#define SEND_BUF 1027
int server;
SSL_CTX *ctx;
endpoint *e;
env arguments = { 1965, ".", "../ssl/cert.pem", "../ssl/key.pem" };
void handle_sighup(int signum) {
printf("Regenerating endpoints...\n");
char *e_file = malloc(strlen(arguments.dir) + 11);
sprintf(e_file, "%s/%s", arguments.dir, "endpoints");
int ne = line_count(e_file);
free(e);
e = malloc((ne + 1) * sizeof(endpoint)); // + 1 to compensate for end marker
get_endpoints(e, e_file);
}
void handle_sigint(int signum) {
printf("Got signal %d, shutting down...\n", signum);
close(server);
SSL_CTX_free(ctx);
exit(0);
}
void send_error(SSL *ssl, response resp, char *error_text) {
char header[5 + strlen(error_text)];
sprintf(header, "%d %s\r\n", resp.code, error_text);
SSL_write(ssl, header, strlen(header));
printf("Error: %s", header);
}
void handle(SSL *ssl, endpoint *e) {
// Initialize buffer and response data
char buf[SEND_BUF] = {0};
int fd, mlen;
if (SSL_accept(ssl) == -1) {
ERR_print_errors_fp(stderr);
fd = SSL_get_fd(ssl);
SSL_free(ssl);
close(fd);
return;
}
// Read into buffer
mlen = SSL_read(ssl, buf, sizeof(buf));
buf[mlen] = '\0';
if (mlen <= 0) {
ERR_print_errors_fp(stderr);
fd = SSL_get_fd(ssl);
SSL_free(ssl);
close(fd);
return;
}
printf("C: %s", buf);
// Send response header
response resp = url_to_response(buf, e);
if (resp.code != 20) {
send_error(ssl, resp, resp.mime); // resp.mime stores the error message
close_ssl(ssl);
return;
}
char *header = malloc(2 + strlen(resp.mime));
sprintf(header, "%d ", resp.code);
strcat(header, resp.mime);
strcat(header, "\r\n");
SSL_write(ssl, header, strlen(header));
free(header);
// Send response body
int sfd, n;
struct stat file_stat;
if ((sfd = open(resp.file_path, O_RDONLY)) < 0) {
resp.code = 40;
send_error(ssl, resp, "Failed to open file");
close_ssl(ssl);
return;
}
if ((fstat(sfd, &file_stat)) < 0) {
resp.code = 40;
send_error(ssl, resp, "Failed to stat file");
close_ssl(ssl);
return;
}
printf("S: %s %s\n", resp.mime, resp.file_path);
while ((n = read(sfd, buf, SEND_BUF))) {
if (SSL_write(ssl, buf, n) < 0) {
ERR_print_errors_fp(stderr);
break;
}
}
close(sfd);
close_ssl(ssl);
}
int main(int argc, char **argv) {
// Assign signal handlers
signal(SIGINT, handle_sigint);
signal(SIGHUP, handle_sighup);
signal(SIGCHLD, SIG_IGN);
// Parse command-line arguments
argp_parse(&parser, argc, argv, 0, 0, &arguments);
// Initialize SSL
SSL_library_init();
ctx = init_ctx();
// Load certificates
load_cert(ctx, arguments.cert, arguments.key);
// Create endpoints
char *e_file = malloc(strlen(arguments.dir) + 11);
sprintf(e_file, "%s/%s", arguments.dir, "endpoints");
handle_sighup(SIGHUP);
// Initialize server
server = init_fd(arguments.port);
printf("Listening on port %d...\n", arguments.port);
// Accept connections
while (1) {
// Initialize incoming client
struct sockaddr_in addr;
socklen_t addrlen = sizeof(addr);
SSL *ssl;
// Accept connection
int client;
if ((client = accept(server, (struct sockaddr *)&addr, (socklen_t*)&addrlen)) < 0) {
fprintf(stderr, "Error: Failed to accept incoming connection");
continue;
}
printf("New: %s:%d\n", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
switch (fork()) {
case 0:
ssl = SSL_new(ctx);
SSL_set_fd(ssl, client);
handle(ssl, e);
exit(0);
break;
case -1:
fprintf(stderr,"Error: Forking failed.\n");
default:
close(client);
}
}
close(server);
SSL_CTX_free(ctx);
return EXIT_SUCCESS;
}